Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Mazda CX-3 AWDFACTORY OEM SERVICE PROCEDURE
Resistance Inspection
- Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
- Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
- Remove the intake manifold. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
- Remove the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION .)
- Measure the resistance between KS terminals A and B.
- If not as specified, replace the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION .)
Specification (Reference)
504-616 kilohms [10-30°C {50-86°F}]
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.